import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int x = sc.nextInt();
		int[] c = new int[n];
		for (int i = 0; i < n; i++) {
			c[i] = sc.nextInt();
		}
		sc.close();

		int min = 100;
		int max = 0;
		for (int i = 0; i < n; i++) {
			min = Math.min(min, c[i]);
			max = Math.max(max, c[i]);
		}
		if (min <= x && x <= max) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
}